1261468641 has 4 divisors (see below), whose sum is σ = 1681958192. Its totient is φ = 840979092.

The previous prime is 1261468633. The next prime is 1261468657. The reversal of 1261468641 is 1468641621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1261468641 - 2³ = 1261468633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261468641.

It is not an unprimeable number, because it can be changed into a prime (1261468631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210244771 + ... + 210244776.

It is an arithmetic number, because the mean of its divisors is an integer number (420489548).

Almost surely, 2^1261468641 is an apocalyptic number.

It is an amenable number.

1261468641 is a deficient number, since it is larger than the sum of its proper divisors (420489551).

1261468641 is an equidigital number, since it uses as much as digits as its factorization.

1261468641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420489550.

The product of its digits is 55296, while the sum is 39.

The square root of 1261468641 is about 35517.1598104353. The cubic root of 1261468641 is about 1080.5017790065.

The spelling of 1261468641 in words is "one billion, two hundred sixty-one million, four hundred sixty-eight thousand, six hundred forty-one".